Temperature Interface

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This page is about temp 1.0. This has never been sold, will never be. Has to be updated for temp 1.1.

This is the documentation page for the SPI_temp and I2C_temp boards.


Assembly instructions

Possible Configurations

Option 1: cheap, simple, positive only LM35.

  • Install solder jumper
  • don't install diode, capacitor, resistors.

Option 2: LM35 with negative temperatures.

  • install diode,
  • install pullup resistor? 50k
  • install pulldown resistor 15k.
  • Optional capacitor 100n.
  • do not install solder jumper.

Option 3: thermocouple.

  • install diode,
  • install pullup.
  • do not install pulldown.
  • do not install solder jumper.

Diodes: PNB7000 or BAS31S or BAV99. should all work. Others should work too. The idea is that at 0.1mA forward current the voltage drop is about 1V.

External resources


Additional software

Related projects



Jumper settings


For the intro to the SPI and I2C protocols read: SPI versus I2C protocols

The board specific protocol can be found here: DIO_protocol

You should also read the General_SPI_protocol notes.
For arduino, a sample PDE is available, called ardemo_lcd.pde, also at the BitWizard software download directory .

This is a demo to send things using SPI to the lcd board. The SPI routines there are applicable for the DIO, 3FETS and 7FETS boards as well.

The software

Default operation

Future hardware enhancements

Future software enhancements



  • Initial public release